Compilare: user.cpp: In function ‘int main()’: user.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<neighbors[i].size();j++) ^ user.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<neighbors[i].size();j++) ^ user.cpp:40:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<neighbors[vec].size();k++) ^ user.cpp:16:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&V,&E); ^ user.cpp:20:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^